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Yes you can. In fact you can use #10 copper conductor with an insulation factor of 90 degrees C because it is protected by a 30 amp rated breaker. A #8 copper conductor with an insulation factor of 90 degrees C is rated at 40 amps. The only time you need to go to a larger size conductor is when you have to overcome voltage drop on longer runs.

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Q: Can I use a 30 amp disconnect switch non fused on 30 amp breaker with wire size 8 and its running a 25 amp shop heater?
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